EP1543924B1 - Polisher brush - Google Patents
Polisher brush Download PDFInfo
- Publication number
- EP1543924B1 EP1543924B1 EP03741368A EP03741368A EP1543924B1 EP 1543924 B1 EP1543924 B1 EP 1543924B1 EP 03741368 A EP03741368 A EP 03741368A EP 03741368 A EP03741368 A EP 03741368A EP 1543924 B1 EP1543924 B1 EP 1543924B1
- Authority
- EP
- European Patent Office
- Prior art keywords
- brush
- wire
- grinding elements
- shaped grinding
- holder
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Expired - Lifetime
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Classifications
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B24—GRINDING; POLISHING
- B24D—TOOLS FOR GRINDING, BUFFING OR SHARPENING
- B24D13/00—Wheels having flexibly-acting working parts, e.g. buffing wheels; Mountings therefor
- B24D13/14—Wheels having flexibly-acting working parts, e.g. buffing wheels; Mountings therefor acting by the front face
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B24—GRINDING; POLISHING
- B24D—TOOLS FOR GRINDING, BUFFING OR SHARPENING
- B24D18/00—Manufacture of grinding tools or other grinding devices, e.g. wheels, not otherwise provided for
- B24D18/0072—Manufacture of grinding tools or other grinding devices, e.g. wheels, not otherwise provided for using adhesives for bonding abrasive particles or grinding elements to a support, e.g. by gluing
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- A—HUMAN NECESSITIES
- A46—BRUSHWARE
- A46B—BRUSHES
- A46B13/00—Brushes with driven brush bodies or carriers
- A46B13/008—Disc-shaped brush bodies
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- A—HUMAN NECESSITIES
- A46—BRUSHWARE
- A46B—BRUSHES
- A46B9/00—Arrangements of the bristles in the brush body
- A46B9/08—Supports or guides for bristles
- A46B9/10—Adjustable supports
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B24—GRINDING; POLISHING
- B24D—TOOLS FOR GRINDING, BUFFING OR SHARPENING
- B24D13/00—Wheels having flexibly-acting working parts, e.g. buffing wheels; Mountings therefor
- B24D13/14—Wheels having flexibly-acting working parts, e.g. buffing wheels; Mountings therefor acting by the front face
- B24D13/145—Wheels having flexibly-acting working parts, e.g. buffing wheels; Mountings therefor acting by the front face having a brush-like working surface
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- A—HUMAN NECESSITIES
- A46—BRUSHWARE
- A46B—BRUSHES
- A46B2200/00—Brushes characterized by their functions, uses or applications
- A46B2200/30—Brushes for cleaning or polishing
- A46B2200/3093—Brush with abrasive properties, e.g. wire bristles
Definitions
- the present invention relates to a polisher brush comprising a brush-shaped grindstone for deburring and polishing.
- a manufacturing method for the brush-shaped grindstone for deburring and polishing is also described, but does not form part of the present invention.
- Precision components primarily used in automobile parts, aircraft parts, and the like are worked with precision and high accuracy primarily by means of numerically controlled lathes, numerically controlled milling machines, machining centers, robots, special purpose machines, and other automatic machines, using end mills, drills, dies, taps, grindstones, and other tools.
- Such post-working tools conventionally involve the use of nylon brushes with abrasive grain, brass brushes, wire brushes, shot blasts, barrels, paper, and the like. Much of the final finishing process further involves manual work.
- nylon brushes with abrasive grains, brass brushes, wire brushes, shot blasts, barrels, paper, or the like, used in conventional working have drawbacks in that removal efficiency of these burrs, work marks, and the like, and the polishing efficiency is poor.
- Conventional post-working tools have poor working accuracy, and have drawbacks in that burrs, work marks, and the like are left, and there is great variation in the manufacturing quality after working.
- burrs are primarily removed from precision components by hand in a separate step away from the automated line, total inspection is performed thereafter, and it is therefore difficult to automate burr removal.
- An object of the present invention is to provide a polisher brush having a brush-shaped grindstone whereby burrs, work marks, and the like can be removed from precision work components, polishing can be performed, and other processes can be conducted with good efficiency and high accuracy.
- JP 2003136413 A discloses a polisher brush comprising a brush-shaped grindstone having a plurality of wire-shaped grinding elements, a cylindrical brush case for mounting the brush-shaped grindstone, and screws for fixing the brush-shaped grindstone on the brush case, wherein the brush-shaped grindstone has a holder fixed by the screws on an interior side of the brush case, a plurality of embedding holes formed in the holder in isolated positions, and rod assemblies whose base end portions are embedded in the respective embedding holes, each rod assembly being composed of a plurality of wire-shaped grinding elements, and free ends of the wire-shaped grinding elements protruding from the lower end portion of the brush case.
- the wire-shaped grinding elements have a substantially circular cross-section.
- the present invention aims at improving such a polisher brush.
- Another object of the present invention is to provide a brush for polishers that are suitable for automating the removal of burrs, work marks, and the like, and for automating polishing operations in which a brush-shaped grindstone is used.
- the cross-sections of the wire-shaped grinding elements take a configuration in which the shape is flat.
- the cross-sections of the wire-shaped grinding elements are flat, plugging is less likely to occur during burr removal and polishing work than with a configuration in which the shape of the cross-section is substantially circular.
- An advantage is obtained whereby flexibility is exhibited in the wire-shaped grinding elements, and breaking is minimized.
- the cross-sections of the wire-shaped grinding elements are flat, and the ratio of flatness represented by L/T is preferably 1.6 to 15, but is more preferably in a range of 1.6 to 10, where L is the major diameter of the cross-section, and T is the minor diameter of the cross-section.
- a manufacturing method for the brush-shaped grindstone having wire-shaped grinding elements formed such that a composite yarn composed of inorganic filaments is impregnated and hardened with a resin, and also having a holder for holding base end sides of a plurality of wire-shaped grinding elements on a grindstone holding surface comprising steps of forming a plurality of embedding holes that open on the grindstone holding surface in isolated positions; forming rod assemblies by bringing a plurality of wire-shaped grinding elements together; and embedding base end sides of the rod assemblies in the embedding holes and fixing with adhesive.
- the rod assemblies are separated from each other because the plurality of embedding holes are formed in isolated positions on the grindstone holding surface of the holder.
- the grindability is therefore excellent because the shavings are efficiently expelled during grinding work and the heat dissipating effect is high. Removal of burrs and work marks from the precision work component, polishing, and other processes can further be performed with good efficiency and high accuracy.
- the cost can also be reduced because high grinding performance can be obtained with a small number of rods.
- the nylon filaments can be prevented from unraveling by folding base end sides to provide thickness and then embedding the filaments in holes in the holder, but when wire-shaped grinding elements composed of inorganic filaments are used, the base end sides cannot be folded as can nylon filaments containing abrasive grain because wire-shaped grinding elements composed of inorganic filaments break when folded.
- the wire-shaped grinding elements do not unravel, because the base end sides of the rod assemblies are fixed inside the embedding holes of the holder with adhesive.
- the brush-shaped grindstone can be efficiently manufactured because a plurality of rod assemblies are batch manufactured, and these are inserted in succession in the embedding holes of the holder and fixed with adhesive.
- the configuration is one in which large numbers of wire-shaped grinding elements are subdivided as rod assemblies and fixed, so the safety is high because the wire-shaped grinding elements remain mostly in place. Even when the grinding performance is increased with the cross-sections of the wire-shaped grinding elements in an elliptical shape, the orientation of the cross-sectional shapes thereof are random, so the grinding performance can be further improved and the roughness of finished surface can be improved.
- round holes are formed as the embedding holes in the holder, and when the rod assemblies are formed, the plurality of wire-shaped grinding elements are roundly bundled.
- grooves are formed as the embedding holes in the holder, and when the rod assemblies are formed, the plurality of wire-shaped grinding elements may be flatly aligned.
- the wire-shaped grinding elements can take a configuration in which the inorganic filaments form a composite yarn without being twisted, or a configuration in which the inorganic filaments form a composite yarn having been twisted.
- a configuration in which the inorganic filaments form a composite yarn having been twisted an advantage is obtained whereby leading ends of the wire-shaped grinding elements are resistant to splitting.
- the brush-shaped grindstone in which the present invention is applied may, for example, be used as a polisher brush in which the holder is fixed with screws on an interior side of a brush case so that free ends of the wire-shaped grinding elements protrude from a lower end portion of the brush case.
- a spindle extended inside of the brush case in an axial direction thereof, and guide holes extended in the form of grooves in a peripheral wall of the brush case in the axial direction of the brush case; an axle hole in which the spindle is fitted, and screw holes that extend from an external peripheral surface of the holder to the axle hole are formed in the holder; and the screws are secured in the screw holes so as to be attached to the external peripheral side of the brush case and to pass completely through the guide holes in a state in which leading end portions of screw shafts make contact with an external peripheral surface of the spindle.
- the holder is fitted within the brush case, and because the spindle is fitted into the axle hole of the holder, the holder does not tilt inside the case even in the cased of considerable dimensional tolerance between an outer diameter of the holder and an inner diameter of the brush case. There is therefore no variation in the protruding length of the wire-shaped grinding elements. Because the spindle is fitted into the axle hole of the holder, the holder can remain fixed at a center position of the brush case even with considerable dimensional tolerance between the outside diameter of the holder and the inside diameter of the brush case.
- the protruding length of the wire-shaped grinding elements at the lower end portion of the brush case can be easily adjusted because the holder can be smoothly moved inside the brush case by loosening the screw.
- the working precision can also be improved because the wire-shaped grinding elements are uniformly abraded. Since no variation occurs in the length (strand length) of the wire-shaped grinding elements from the holder, the change in conformability and grindability due to this effect is reduced, so the working precision is stable.
- the surrounding area where the leading ends of screw shafts contact on the external peripheral surface of the spindle is preferably a flat surface.
- the spindle is normally formed from a round rod or circular pipe, and the leading end portions of the screw shafts are brought into contact with the external peripheral surface thereof. Fashioning the surrounding area in contact with the leading end portions of the screw shafts in a flat surface prevents the leading end portions of the screw shafts from shifting on the external peripheral surface of the spindle even when the polisher brush rotates at high speed, because the leading ends of the screw shaft make stable contact with the external peripheral surface of the spindle.
- a space is further formed between the external peripheral surface of the spindle and the internal peripheral surface of the axle hole of the holder in the portion in which this flat surface is formed because the surrounding area where the leading end portions of the screw shafts make contact is flat.
- the guide holes extend parallel in the axial direction on the peripheral wall of the brush case. Such a configuration allows guide holes to easily be formed even if the peripheral wall of the brush case is cylindrical.
- a projecting portion that projects to the external peripheral side is preferably attached to the lower end side of the spindle.
- the situation in which the wire-shaped grinding elements positioned on the interior peripheral side become less abrasive can therefore be avoided because no difference in rigidity is exhibited between the wire-shaped grinding elements positioned on the external peripheral side and the wire-shaped grinding elements positioned on the interior peripheral side.
- the working precision can also be improved because the wire-shaped grinding elements are uniformly abraded. Since no variation occurs in the length (strand length) of the wire-shaped grinding elements from the holder, the change in conformability and grindability due to this effect is reduced, so the working precision is stable. At this point, if the projecting portion is attached with screws and screw stops so as to allow easy removal, the work of replacing worn wire-shaped grinding elements can easily be performed.
- a projecting portion that projects to the external peripheral side is preferably attached to the lower end side of the spindle, a plurality of protrusions extended in a radial manner toward the external peripheral side are formed on an external peripheral side of the projecting portion, and the wire-shaped grinding elements are evenly positioned between the protrusions.
- the situation in which the wire-shaped grinding elements positioned on the interior peripheral side become less abrasive can therefore be avoided because no difference in rigidity is exhibited between the wire-shaped grinding elements positioned on the external peripheral side and the wire-shaped grinding elements positioned on the interior peripheral side.
- the working precision can also be improved because the wire-shaped grinding elements are uniformly abraded. Since no variation occurs in the length (strand length) of the wire-shaped grinding elements from the holder, the change in conformability and grindability due to this effect is reduced, so the working precision is stable. Variation in the rigidity of the wire-shaped grinding elements can be reduced in the peripheral direction as well because the protrusions prevent the wire-shaped grinding elements from escaping in the peripheral direction. At this point, if the projecting portion is attached with screws and screw stops so as to allow easy removal, the work of replacing worn wire-shaped grinding elements can easily be performed.
- a plurality of protrusions extended in a radial manner toward the external peripheral side are preferably attached to the spindle, and the wire-shaped grinding elements are evenly positioned between the protrusions.
- the situation in which the wire-shaped grinding elements positioned on the interior peripheral side become less abrasive can therefore be avoided because no difference in rigidity is exhibited between the wire-shaped grinding elements positioned on the external peripheral side and the wire-shaped grinding elements positioned on the interior peripheral side.
- the working precision can also be improved because the wire-shaped grinding elements are uniformly abraded. Since no variation occurs in the length (strand length) of the wire-shaped grinding elements from the holder, the change in conformability and grindability due to this effect is reduced, so the working precision is stable. Variation in the rigidity of the wire-shaped grinding elements can be reduced in the peripheral direction as well because the protrusions prevent the wire-shaped grinding elements from escaping.
- the wire-shaped grinding elements have a flat cross-section, although a circular cross-section is shown in the drawings.
- the wire-shaped grinding elements have a substantially circular cross-section. It is, however, stressed that according to the present invention, the cross-section of the wire-shaped grinding elements is flat.
- FIG. 1 is a diagram depicting a state in which an upper portion (holder side) of a brush-shaped grindstone is inserted and fixed in an interior of a brush case in a polisher brush wherein the present invention has been applied.
- FIG. 2 is a cross-sectional view through a section in which the polisher brush depicted in FIG. 1 is fixed in place with screws.
- FIG. 3 is a bottom view of the polisher brush depicted in FIG. 1 .
- FIG. 4 is an exploded perspective view depicting a state in which the polisher brush depicted in FIG. 1 is disassembled into the brush case and the brush-shaped grindstone.
- FIG. 5 are, respectively, a diagram depicting a state in which a surrounding region where the guide holes open is made into a flat surface on an external peripheral surface of a peripheral wall of the brush case in the polisher brush depicted in FIG. 1 ; a diagram depicting a state in which a surrounding region where a leading end portion of an axle portion of a screw makes contact on an external peripheral surface of the spindle; a longitude-sectional view depicting an enlarged view of a portion that stops the screw; and a cross-sectional view depicting an enlarged view of the portion that stops the screw.
- the polisher brush 1 of the present embodiment comprises a cylindrical metal brush case 2 that comprises a connecting shaft 21 for driving on an upper portion; a brush-shaped grindstone 3 whose upper portion is inserted into this brush case 2; and screws 41 and 42 for fixing this brush-shaped grindstone 3 in a predetermined position inside the brush case 2.
- an upper end portion of a round virgate spindle 25 is fixed in the center of an upper bottom portion of the brush case 2, and this spindle 25 extends in a direction of an axis line L concentrically with a peripheral wall 20 in the interior side of the brush case 2.
- guide holes 26 and 27, extended in the form of a groove in a direction parallel to the direction of the axis line L thereof, are formed in point-symmetrical positions on opposite sides of the axis line L.
- the brush case 2 is composed such that the peripheral wall 20 is aluminum and the spindle 25 is stainless steel.
- the brush-shaped grindstone 3 comprises a cylindrical metal holder 31 wherein a plurality of embedding holes 310 are formed in isolated positions on a grinding element holding surface 311, and rod assemblies 320 whose base end portions are embedded in the embedding holes 310.
- the rod assemblies 320 comprise a large number of wire-shaped grinding elements 32, obtained such that a composite yarn composed of inorganic filaments such as alumina filaments is impregnated and hardened with a binder resin.
- An axle hole 30 through which the spindle 25 is inserted is formed in a center of the holder 31.
- a pair of screw holes 36 and 37 is formed in a peripheral wall of the holder 31 in point-symmetrical positions on the opposite sides of the axis line L, and these screw holes 36 and 37 reach from the external peripheral surface of the peripheral wall of the holder 31 to the axle hole 30.
- the brush-shaped grindstone 3 used in the present embodiment has excellent grindability because large numbers of the wire-shaped grinding elements 32 are subdivided as roundly bundled rod assemblies 320 and fixed with adhesive in the plurality of embedding holes 310 of the holder 31, so the shavings are efficiently expelled during grinding work and the heat dissipating effect is high. Removal of burrs and work marks from the precision work component, polishing, and other processes can further be performed with good efficiency and high accuracy. The cost can also be reduced because high grinding performance can be obtained with a small number of rods. Adopting a configuration in which large numbers of the wire-shaped grinding elements 32 are subdivided and fixed makes it possible to prevent the wire-shaped grinding elements 32 from unraveling. This configuration is therefore advantageous in that it is highly safe.
- the spindle 25 is fitted in the axle hole 30 of the holder 31, the upper portion (on a side of the holder 31) of the brush-shaped grindstone 3 is inserted inside the brush case 2, the screws 41 and 42 are thereafter passed through the guide holes 26 and 27 from the external peripheral side of the brush case 2, as shown in FIGS. 5(C) and (D) , and the screws 41 and 42 are respectively screwed into the screw holes 36 and 37 of the holder 31. At this point, the screws 41 and 42 are tightened until the leading end portions of the axle portions of the screws 41 and 42 make contact with the external peripheral surface of the spindle 25. As a result, the holder 31 is fixed onto the spindle 25 of the brush case 2 by way of the screws 41 and 42 inside the brush case 2.
- the screws 41 and 42 are shallowly screwed into the screw holes 36 and 37 of the holder 31 through the guide holes 26 and 27 of the brush case 2, and, in this state, the position of the brush-shaped grindstone 3 inside the brush case 2 can be adjusted in the direction of the axis line L by moving the brush-shaped grindstone 3 inside the brush case 2 in the direction of the axis line L.
- a protruding length of a free end 33 of the wire-shaped grinding elements 32 at a lower end portion 29 of the brush case 2 can be adjusted, so the stiffness of the wire-shaped grinding elements 32, in other words, the grindability and conformability can be optimized.
- Adopting such a fixed configuration by way of the screws 41 and 42 entails having flat surfaces 260 and 270 on an external peripheral surface of the peripheral wall 20 of the brush case 2 in the area surrounding the openings of the guide holes 26 and 27, as shown in FIGS. 5(A), (C), and (D) .
- a surrounding area where the leading end portions of the axle portions of the screws 41 and 42 make contact on the external peripheral surface of the spindle 25 is a flat surface 250, as shown in FIGS. 5(B), (C), and (D) .
- the polisher brush 1 assembled in this manner is linked to a polisher by way of a connecting shaft 21 for driving, which protrudes at a top portion of the brush case 2.
- the polisher brush 1 is then rotatably driven about the axis line L to remove all types of burrs and perform polishing work.
- the polisher brush 1 is not limited to rotary motion, but reciprocating action, oscillating action, swinging action, or a combination of these actions may be used to conduct motion.
- the movement may also be combined with motion that vertically moves the brush 1 for polishing in the direction of the axis line L.
- the wire-shaped grinding elements 32 also abrade as such, and the protruding length of the wire-shaped grinding elements 32 at the lower end portion 29 of the brush case 2 becomes shorter.
- Excellent burr removal and polishing work cannot be performed in this situation, so the protruding length of the wire-shaped grinding elements 32 at the lower end portion 29 of the brush case 2 must be adjusted and the stiffness of the wire-shaped grinding elements 32, in other words, the grindability and conformability must be adjusted.
- This adjustment operation entails loosening the screws 41 and 42, moving the brush-shaped grindstone 3 in the direction of the axis line L inside the brush case 2, and shifting the position of the brush-shaped grindstone 3 downward in direction of the axis line L inside the brush case 2.
- the protruding length of the free end 33 of the wire-shaped grinding elements 32 at the lower end portion 29 of the brush case 2 can therefore again be adjusted to an optimal length.
- the brush-shaped grindstone 3 at this time moves in the brush case 2 along the guide holes 26 and 27, because the screws 41 and 42, which are screwed into the screw holes 36 and 37 of the brush-shaped grindstone 3 through the guide holes 26 and 27 from the external peripheral side of the brush case 2, are guided by the guide holes 26 and 27.
- the screws 41 and 42 can conveniently be used to guide the brush-shaped grindstone 3 when it is moved along the guide holes 26 and 27, and to fix the brush-shaped grindstone 3 in a predetermined position within the brush case 2.
- the holder 31 is fitted into the brush case 2, and the spindle 25 is fitted into the axle hole 30 of the holder 31.
- the holder 31 does not tilt inside the brush case 2 even with considerable dimensional tolerance between an outer diameter of the holder 31 and an inner diameter of the brush case 2.
- the depth of cutting of the wire-shaped grinding elements 32 into the work is fixed, so the precision during grinding is improved.
- the holder 31 is fitted into the brush case 2, but because the spindle 25 is fitted into the axle hole 30 of the holder 31, the holder 31 remains fixed in the center position of the brush case 2 even with considerable dimensional tolerance between the outside diameter of the holder 31 and the inside diameter of the brush case 2. There is, therefore, no runout during rotation. Furthermore, the dimensional tolerance between the outside diameter of the holder 31 and the inside diameter of the brush case 2 need not to be strict. Thus, even when shavings enter a space between the holder 31 and the brush case 2, the protruding length of the wire-shaped grinding elements 32 at the lower end portion 29 of the brush case 2 can be easily adjusted because the holder 3 can be smoothly moved inside the brush case 2 by loosening the screws 41 and 42.
- the wire-shaped grinding elements 32 when the wire-shaped grinding elements 32 attempt to escape to an external peripheral side, they bump against an interior surface of the peripheral wall 20 of the brush case 2 and are held back, and when the elements attempt to escape to an interior peripheral side, they bump against the external peripheral side of the spindle 25 and are held back.
- the wire-shaped grinding elements 32 positioned on the external peripheral side there is no leeway that allows easy escape between the wire-shaped grinding elements 32 positioned on the external peripheral side and the wire-shaped grinding elements 32 positioned on the interior peripheral side.
- the situation in which the wire-shaped grinding elements 32 positioned on the interior peripheral side become less abrasive can therefore be avoided because no difference in rigidity is exhibited between the wire-shaped grinding elements 32 positioned on the external peripheral side and the wire-shaped grinding elements 32 positioned on the interior peripheral side.
- the working precision can also be improved because the wire-shaped grinding elements 32 are uniformly abraded. Since no variation occurs in the length (strand length) of the wire-shaped grinding elements 32 from the holder 31, the change in conformability and grindability due to this effect is reduced, so the working precision is stable.
- the area surrounding the openings of the guide holes 26 and 27 has flat surfaces 260 and 270 on the external peripheral surface of the peripheral wall 20 of the brush case 2.
- heads of the screws 41 and 42 are positioned in the area surrounding the openings of the guide holes 26 and 27 on a circular-arc external surface of the peripheral wall 20 of the brush case 2.
- the heads to the screws 41 and 42 can be prevented from protruding far out on the external peripheral surface of the peripheral wall 20 because the area surrounding the openings of the guide holes 26 and 27 has flat surfaces 260 and 270. Even when the polisher brush 1 rotates at high speed about the axis line L, wind noise and the like can be reduced and the safety improved.
- the surrounding area where the leading end portions of the axle portions of the screws 41 and 42 make contact on the external peripheral surface of the spindle 25 is the flat surface 250.
- the spindle 25 is shaped as a round bar, and the leading end portions of the screws 41 and 42 make contact on the external peripheral surface.
- the leading end portions of the screws 41 and 42 stably make contact with the external peripheral surface of the spindle 25 because the surrounding area where the leading end portions of the screws 41 and 42 make contact is a flat surface 250.
- the leading end portions of the screws 41 and 42 are prevented from shifting on the external peripheral surface of the spindle 25 even when the polisher brush 1 rotates at high speed.
- a space is further formed between the external peripheral surface of the spindle 25 and the internal peripheral surface of the axle hole 30 of the holder 31 in the portion in which this flat surface 250 is formed because the surrounding area where the leading end portions of the screws 41 and 42 make contact on the external peripheral surface of the spindle 25 is a flat surface 250. Therefore, even when the dimensional tolerance between the outside diameter of the spindle 25 and the inside diameter of the axle hole 30 is strict, and the tilt and eccentricity of the holder 31 is more strictly prevented, problems do not arise whereby the holder 31 inside the brush case 2 ceases moving due to the shavings that enter between the external peripheral surface of the spindle 25 and the internal peripheral surface of the axle hole 30.
- the holder 31 can be smoothly moved inside the brush case 2 because the holder 31 is not prevented from moving inside the brush case 2 if the damage is to the flat surface 250.
- FIGS. 6(A) to (E) are diagrams depicting the manufacturing method for the brush-shaped grindstone depicted in FIG. 1 .
- manufacturing the brush-shaped grindstone 3 used in the polisher brush 1 entails forming embedding holes 310 comprising a plurality of round holes in isolated positions in the peripheral direction on the grindstone holding surface 311 of the holder 31, as shown in FIG. 3 in connection with the present embodiment.
- a plurality of wire-shaped grinding elements 32 are roundly bundled in the base end sides to form rod assemblies 320, and the base end sides of the rod assemblies 320 are embedded in embedding holes 310 and fixed with adhesive.
- the wire-shaped grinding elements 32 are then aligned to a predetermined length, and the base end sides are thereafter aligned, as shown in FIG. 6(A) .
- the base end sides of the wire-shaped grinding elements 32 are subsequently inserted into holes 60 in a die material 6 formed to substantially the same size as the embedding holes 310 of the holder 31, as shown in FIG. 6(B) , and in this state the base end sides of the wire-shaped grinding elements 32 are fixed with silicon, epoxy, or another type of adhesive.
- rod assemblies 320 whose base end sides are fixed with adhesive 71 are formed, as shown in FIG. 6(C) .
- Silicon, epoxy, or another type of adhesive 72 for example, is subsequently applied to the base end sides of the rod assemblies 320, as shown in FIG. 6(D) ; this is thereafter embedded in the embedding holes 310 of the holder 32, as shown in FIG. 6(E) ; and in this state the adhesive 72 is hardened and the base end sides of the rod assemblies 320 are fixed in the embedding holes 310 by bonding.
- a plurality of wire-shaped grinding elements 32 is bundled to form rod assemblies 320, which are embedded in the embedding holes 310 of the holder 31 and fixed by bonding. Therefore, because a plurality of rod assemblies 320 are batch manufactured, and these are successively inserted into the embedding holes 310 of the holder 31 and are fixed by bonding, the brush-shaped grindstone 3 can be manufactured with excellent efficiency.
- the nylon filaments containing abrasive grain can be prevented from unraveling by folding the base end side to provide thickness and then embedding them in holes in the holder, but wire-shaped grinding elements 32 that use inorganic filaments break when folded, so the base end side cannot be folded as can nylon filaments or other materials.
- the base end side of a bundle of wire-shaped grinding elements 32 is hardened with adhesive 71 in advance, and the base end side thereof has substantially the same diameter as the embedding holes 310, so with the rod assemblies 320 embedded in embedding holes 310, the rod assemblies 320 do not fall over. The productivity of the brush-shaped grindstone 3 can therefore be improved.
- the wire-shaped grinding elements 32 do not unravel, because the base end sides of the wire-shaped grinding elements 32 are hardened with adhesive 71.
- FIGS. 7(A) and (B) are, respectively, a diagram and a bottom view that schematically depict the polisher brush related to embodiment 2 of the present invention.
- a discoid projecting portion 50 that projects to the external peripheral side is attached to the lower end side of the spindle 25 with screws 55, screw stops, or the like so as to allow easy removal, as shown in FIGS. 7(A) and (B) .
- the other features of this structure are the same as embodiment 1, and are therefore omitted from the description.
- the wire-shaped grinding elements 32 when the wire-shaped grinding elements 32 attempt to escape to the external peripheral side, they bump against the interior surface of the peripheral wall 20 of the brush case 2 and are held back, and when the elements attempt to escape to the interior peripheral side, they bump against an external peripheral surface of the projecting portion 50 disposed on the spindle 25 and are held back. As a result, there is no leeway that allows easy escape between the wire-shaped grinding elements 32 positioned on the external peripheral side and the wire-shaped grinding elements 32 positioned on the interior peripheral side.
- the situation in which the wire-shaped grinding elements 32 positioned on the interior peripheral side become less abrasive can therefore be avoided because no difference in rigidity is exhibited between the wire-shaped grinding elements 32 positioned on the external peripheral side and the wire-shaped grinding elements 32 positioned on the interior peripheral side.
- the working precision can also be improved because the wire-shaped grinding elements 32 are uniformly abraded. Since no variation occurs in the length (strand length) of the wire-shaped grinding elements 32 from the holder 31, the change in grindability and conformability due to this effect is reduced, so the working precision is stable.
- the holder 31 can be removed from the spindle 25 merely by removing the projecting portion 50 because the projecting portion 50 is attached with a screw 55 to the spindle 25 so as to allow easy removal.
- the wire-shaped grinding elements 32 become worn out, the work of replacing the wire-shaped grinding elements 32 and the holder 31 with new ones can therefore easily be performed.
- FIGS. 8(A) and (B) are, respectively, a diagram and a bottom view that schematically depict the polisher brush related to embodiment 3 of the present invention.
- a projecting portion 50 that projects to the external peripheral side at the lower end side is attached to the lower end surface of the spindle 25 with screws 55, screw stops, or the like so as to allow easy removal, as shown in FIGS. 8(A) and (B) ; a plurality of protrusions 51 extended in a radial manner toward the external peripheral side are further formed on an external peripheral side of this projecting portion 50; and wire-shaped grinding elements 32 are evenly positioned between these protrusions 51.
- the other features of this structure are the same as embodiment 1, and are therefore omitted from the description.
- the wire-shaped grinding elements 32 when the wire-shaped grinding elements 32 attempt to escape to the external peripheral side, they bump against the interior surface of the peripheral wall 20 of the brush case 2 and are held back, and when the elements attempt to escape to the interior peripheral side, they bump against the external peripheral side of the projecting portion 50 disposed on the spindle 25, escape is restrained, and the range of escape is narrowed by the protrusions 51. As a result, there is no difference in the extend of escape between the wire-shaped grinding elements 32 positioned on the external peripheral side and the wire-shaped grinding elements 32 positioned on the interior peripheral side.
- the situation in which the wire-shaped grinding elements 32 positioned on the interior peripheral side become less abrasive can therefore be avoided because no difference in rigidity is exhibited between the wire-shaped grinding elements 32 positioned on the external peripheral side and the wire-shaped grinding elements 32 positioned on the interior peripheral side.
- the working precision can also be improved because the wire-shaped grinding elements 32 are uniformly abraded. Since no variation occurs in the length (strand length) of the wire-shaped grinding elements 32 from the holder 31, the change in grindability and conformability due to this effect is reduced, so the working precision is stable.
- the variation in the rigidity of the wire-shaped grinding elements 32 can be reduced in the peripheral direction as well because the wire-shaped grinding elements 32 can be prevented from escaping in the peripheral direction by the protrusions 51.
- the holder 31 can be removed from the spindle 25 merely by removing the projecting portion 50 because the projecting portion 50 is attached with a screw 55 to the spindle 25 so as to allow easy removal.
- the wire-shaped grinding elements 32 become worn out, the work of replacing the wire-shaped grinding elements 32 and the holder 31 with new ones can therefore easily be performed.
- FIGS. 9(A) and (B) are, respectively, a diagram and a bottom view that schematically depict the polisher brush related to embodiment 4 of the present invention.
- a cylindrical body 520 comprising a plurality of protrusions 52 in a form of blades extended in a radial manner toward the external peripheral side is attached to the lower end surface of the spindle 25 with screws 55, screw stops, or the like so as to allow easy removal, as shown in FIGS. 9(A) and (B) , and wire-shaped grinding elements 32 are evenly positioned between these protrusions 52.
- the other features of this structure are the same as embodiment 1, and are therefore omitted from the description.
- the wire-shaped grinding elements 32 when the wire-shaped grinding elements 32 attempt to escape to the external peripheral side, they bump against the interior surface of the peripheral wall 20 of the brush case 2 and are held back. When the wire-shaped grinding elements 32 attempt to escape to the interior peripheral side, they bump against the external peripheral surface of the spindle 25, escape is restrained, and the range of escape is narrowed by the protrusions 52. As a result, there is no difference in the extend of escape between the wire-shaped grinding elements 32 positioned on the external peripheral side and the wire-shaped grinding elements 32 positioned on the interior peripheral side.
- the situation in which the wire-shaped grinding elements 32 positioned on the interior peripheral side become less abrasive can therefore be avoided because no difference in rigidity is exhibited between the wire-shaped grinding elements 32 positioned on the external peripheral side and the wire-shaped grinding elements 32 positioned on the interior peripheral side.
- the working precision can also be improved because the wire-shaped grinding elements 32 are uniformly abraded. Since no variation occurs in the length (strand length) of the wire-shaped grinding elements 32 from the holder 31, the change in grindability and conformability due to this effect is reduced, so the working precision is stable.
- the variation in the rigidity of the wire-shaped grinding elements 32 can be reduced in the peripheral direction as well because the wire-shaped grinding elements 32 can be prevented from escaping in the peripheral direction by the protrusions 52.
- the holder 31 can be removed from the spindle 25 merely by removing the cylindrical body 520 because the cylindrical body 520 comprising blade-shaped protrusions 52 is attached with a screw 55 to the spindle 25 so as to allow easy removal.
- the wire-shaped grinding elements 32 become worn out, the work of replacing the wire-shaped grinding elements 32 and the holder 31 with new ones can therefore easily be performed.
- the brush-shaped grindstone 3 related to the above embodiments is an example in which the bottom surface of the cylindrical holder 31 serves as the grinding element holding surface 311, and a plurality of embedding holes 310 are formed in a single line about the axis line L of the center of rotation, but the present invention may also be applied to a brush-shaped grindstone 3A in which rod assemblies 320 are embedded in the embedding holes 310 that comprise a plurality of round holes formed in a plurality of lines; for example, two lines, about the axis line L of the center of rotation in the grinding element holding surface 311 comprising the bottom surface of the cylindrical holder 31, as shown in FIG. 10 .
- the present invention may further be applied to a brush-shaped grindstone in which rod assemblies are embedded in embedding holes that comprise a plurality of round holes formed at irregular positions about the axis line of the center of rotation in the grinding element holding surface of holders of various shapes.
- rod assemblies 320 in which the base end portions of a plurality of the wire-shaped grinding elements 21 are roundly bundled, but it is also possible to use rod assemblies 320 in which the base end portions of a plurality of wire-shaped grinding elements 21 are flatly aligned, as shown in FIG. 11(A) .
- a plurality of embedding holes 310 in the form of grooves are formed on the grinding element holding surface 311 comprising the bottom surface of the cylindrical holder 31, rod assemblies 320 in which the base end portions of the plurality of wire-shaped grinding elements 21 are flatly aligned are formed, and the base end sides of these rod assemblies 320 may be fixed with adhesive in the embedding holes 310 of the holder 31, in the manner of the brush-shaped grindstone 3E shown in FIG. 11(B) .
- the composite yarn with the substantially circular cross-section was used in the wire-shaped grinding elements 32 without twisting the inorganic filaments, but a configuration obtained by twisting the inorganic filaments into a composite yarn may also be adopted.
- inorganic filaments are twisted into the composite yarn, an advantage is obtained whereby the leading ends of the wire-shaped grinding elements 32 are resistant to splitting.
- the cross-sections of the wire-shaped grinding elements 32 is illustrated in a configuration in which the shape is substantially circular, according to the present invention the configuration is such that the cross-section is flat.
- the cross-sections of the wire-shaped grinding elements are flat, plugging is minimal during burr removal and polishing in comparison with the configuration in which the shape of the cross-section is substantially circular.
- An advantage is obtained whereby flexibility is exhibited in the wire-shaped grinding elements, and breaking is minimized.
- the ratio of flatness represented by L/T is preferably 1.6 to 15, but is more preferably in a range of 1.6 to 10, where L is the length of the cross-section, and T is the breadth of the cross-section.
- a plurality of wire-shaped grinding elements are bundled to form rod assemblies, and these are embedded in the embedding holes of the holder and fixed by bonding.
- a plurality of rod assemblies are batch manufactured, and these are successively inserted into the embedding holes of the holder and fixed.
- the brush-shaped grindstone can therefore be manufactured with excellent efficiency.
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- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Manufacturing & Machinery (AREA)
- Polishing Bodies And Polishing Tools (AREA)
- Finish Polishing, Edge Sharpening, And Grinding By Specific Grinding Devices (AREA)
- Brushes (AREA)
Description
- The present invention relates to a polisher brush comprising a brush-shaped grindstone for deburring and polishing. A manufacturing method for the brush-shaped grindstone for deburring and polishing is also described, but does not form part of the present invention.
- Precision components primarily used in automobile parts, aircraft parts, and the like are worked with precision and high accuracy primarily by means of numerically controlled lathes, numerically controlled milling machines, machining centers, robots, special purpose machines, and other automatic machines, using end mills, drills, dies, taps, grindstones, and other tools. However, after these precision machines have worked, burrs, work marks, tool marks, or the like are always present, so post-working is required to remove these. Such post-working tools conventionally involve the use of nylon brushes with abrasive grain, brass brushes, wire brushes, shot blasts, barrels, paper, and the like. Much of the final finishing process further involves manual work.
- However, nylon brushes with abrasive grains, brass brushes, wire brushes, shot blasts, barrels, paper, or the like, used in conventional working have drawbacks in that removal efficiency of these burrs, work marks, and the like, and the polishing efficiency is poor. Conventional post-working tools have poor working accuracy, and have drawbacks in that burrs, work marks, and the like are left, and there is great variation in the manufacturing quality after working.
- In the particular case of deburring that involves precision components, it is possible that defective operation of sliding portions, blockage of hydraulic pathways, shorting of electrical circuits, oil leaks, and other critical flaws will result if parts that have burrs left behind or that have variation in manufacturing quality after burr removal are assembled into an apparatus.
- In conventional practice, therefore, burrs are primarily removed from precision components by hand in a separate step away from the automated line, total inspection is performed thereafter, and it is therefore difficult to automate burr removal.
- An object of the present invention is to provide a polisher brush having a brush-shaped grindstone whereby burrs, work marks, and the like can be removed from precision work components, polishing can be performed, and other processes can be conducted with good efficiency and high accuracy.
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JP 2003136413 A - The present invention aims at improving such a polisher brush.
- Another object of the present invention is to provide a brush for polishers that are suitable for automating the removal of burrs, work marks, and the like, and for automating polishing operations in which a brush-shaped grindstone is used.
- To solve the drawbacks described above, according to the present invention, there is prosided a polisher bruch as defined in
claim 1. - In the present invention, the cross-sections of the wire-shaped grinding elements take a configuration in which the shape is flat. When the cross-sections of the wire-shaped grinding elements are flat, plugging is less likely to occur during burr removal and polishing work than with a configuration in which the shape of the cross-section is substantially circular. An advantage is obtained whereby flexibility is exhibited in the wire-shaped grinding elements, and breaking is minimized. The cross-sections of the wire-shaped grinding elements are flat, and the ratio of flatness represented by L/T is preferably 1.6 to 15, but is more preferably in a range of 1.6 to 10, where L is the major diameter of the cross-section, and T is the minor diameter of the cross-section. There is described a manufacturing method for the brush-shaped grindstone having wire-shaped grinding elements formed such that a composite yarn composed of inorganic filaments is impregnated and hardened with a resin, and also having a holder for holding base end sides of a plurality of wire-shaped grinding elements on a grindstone holding surface, comprising steps of forming a plurality of embedding holes that open on the grindstone holding surface in isolated positions; forming rod assemblies by bringing a plurality of wire-shaped grinding elements together; and embedding base end sides of the rod assemblies in the embedding holes and fixing with adhesive.
- In the manufacturing method for the brush-shaped grindstone, the rod assemblies are separated from each other because the plurality of embedding holes are formed in isolated positions on the grindstone holding surface of the holder. The grindability is therefore excellent because the shavings are efficiently expelled during grinding work and the heat dissipating effect is high. Removal of burrs and work marks from the precision work component, polishing, and other processes can further be performed with good efficiency and high accuracy. The cost can also be reduced because high grinding performance can be obtained with a small number of rods.
- Furthermore, in the case of nylon filaments containing abrasive grain, the nylon filaments can be prevented from unraveling by folding base end sides to provide thickness and then embedding the filaments in holes in the holder, but when wire-shaped grinding elements composed of inorganic filaments are used, the base end sides cannot be folded as can nylon filaments containing abrasive grain because wire-shaped grinding elements composed of inorganic filaments break when folded. According to the present invention, however, the wire-shaped grinding elements do not unravel, because the base end sides of the rod assemblies are fixed inside the embedding holes of the holder with adhesive. The brush-shaped grindstone can be efficiently manufactured because a plurality of rod assemblies are batch manufactured, and these are inserted in succession in the embedding holes of the holder and fixed with adhesive. The configuration is one in which large numbers of wire-shaped grinding elements are subdivided as rod assemblies and fixed, so the safety is high because the wire-shaped grinding elements remain mostly in place. Even when the grinding performance is increased with the cross-sections of the wire-shaped grinding elements in an elliptical shape, the orientation of the cross-sectional shapes thereof are random, so the grinding performance can be further improved and the roughness of finished surface can be improved.
- In the present invention, for example, round holes are formed as the embedding holes in the holder, and when the rod assemblies are formed, the plurality of wire-shaped grinding elements are roundly bundled.
- In the present invention, grooves are formed as the embedding holes in the holder, and when the rod assemblies are formed, the plurality of wire-shaped grinding elements may be flatly aligned.
- In the present invention, the wire-shaped grinding elements can take a configuration in which the inorganic filaments form a composite yarn without being twisted, or a configuration in which the inorganic filaments form a composite yarn having been twisted. Of these configurations, when inorganic filaments form a composite yarn having been twisted, an advantage is obtained whereby leading ends of the wire-shaped grinding elements are resistant to splitting.
- The brush-shaped grindstone in which the present invention is applied may, for example, be used as a polisher brush in which the holder is fixed with screws on an interior side of a brush case so that free ends of the wire-shaped grinding elements protrude from a lower end portion of the brush case.
- In this case, a spindle extended inside of the brush case in an axial direction thereof, and guide holes extended in the form of grooves in a peripheral wall of the brush case in the axial direction of the brush case; an axle hole in which the spindle is fitted, and screw holes that extend from an external peripheral surface of the holder to the axle hole are formed in the holder; and the screws are secured in the screw holes so as to be attached to the external peripheral side of the brush case and to pass completely through the guide holes in a state in which leading end portions of screw shafts make contact with an external peripheral surface of the spindle.
- In a polisher brush thus configured, when the brush-shaped grindstone is inserted from a holder side into an interior side of the brush case, the spindle is inserted through the axle hole of the holder. In this state, the screws are inserted into guide holes from an external peripheral side of the brush case until the leading end portions of the screw shafts come in contact with the external peripheral surface of the spindle, and axle portions of the screws tighten in the screw holes of the holder. As a result, the holder is fixed onto the spindle inside the brush case. If the screw is loosened, the protruding length of the wire-shaped grinding elements at the lower end portion of the brush case can be adjusted by moving the holder along the spindle. The axle portion of the screw is guided at this time in the guide holes, and the brush-shaped grindstone moves along the guide holes. The protruding length of the wire-shaped grinding elements at the lower end portion of the brush case can therefore be easily adjusted.
- The holder is fitted within the brush case, and because the spindle is fitted into the axle hole of the holder, the holder does not tilt inside the case even in the cased of considerable dimensional tolerance between an outer diameter of the holder and an inner diameter of the brush case. There is therefore no variation in the protruding length of the wire-shaped grinding elements. Because the spindle is fitted into the axle hole of the holder, the holder can remain fixed at a center position of the brush case even with considerable dimensional tolerance between the outside diameter of the holder and the inside diameter of the brush case. Thus, because the dimensional tolerance between the outside diameter of the holder and the inside diameter of the brush case need not be strict, even when shavings enter the space between these, the protruding length of the wire-shaped grinding elements at the lower end portion of the brush case can be easily adjusted because the holder can be smoothly moved inside the brush case by loosening the screw.
- Even when the wire-shaped grinding elements attempt to escape to the external peripheral side as the polisher brush is rotated to perform polishing or the like, they bump against the interior surface of the peripheral wall of the brush case and are held back, and when the elements attempt to escape to the interior peripheral side, they bump against the external peripheral surface of the spindle and are held back. As a result, there is no difference in the extent of escape between the wire-shaped grinding elements positioned on an external peripheral side and the wire-shaped grinding elements positioned on an interior peripheral side. The situation in which the wire-shaped grinding elements positioned on the interior peripheral side become less abrasive can therefore be avoided because no difference in rigidity is exhibited between the wire-shaped grinding elements positioned on the external peripheral side and the wire-shaped grinding elements positioned on the interior peripheral side. The working precision can also be improved because the wire-shaped grinding elements are uniformly abraded. Since no variation occurs in the length (strand length) of the wire-shaped grinding elements from the holder, the change in conformability and grindability due to this effect is reduced, so the working precision is stable.
- In the present invention, the surrounding area where the leading ends of screw shafts contact on the external peripheral surface of the spindle is preferably a flat surface.
- The spindle is normally formed from a round rod or circular pipe, and the leading end portions of the screw shafts are brought into contact with the external peripheral surface thereof. Fashioning the surrounding area in contact with the leading end portions of the screw shafts in a flat surface prevents the leading end portions of the screw shafts from shifting on the external peripheral surface of the spindle even when the polisher brush rotates at high speed, because the leading ends of the screw shaft make stable contact with the external peripheral surface of the spindle. A space is further formed between the external peripheral surface of the spindle and the internal peripheral surface of the axle hole of the holder in the portion in which this flat surface is formed because the surrounding area where the leading end portions of the screw shafts make contact is flat. Therefore, even when the dimensional tolerance between the outside diameter of the spindle and the inside diameter of the axle hole is strict, and the tilt and eccentricity of the holder are more strictly prevented, problems do not arise whereby the holder inside the brush case ceases moving due to the shavings that enter between the external peripheral surface of the spindle and the internal peripheral surface of the axle hole. Even if the spindle is damaged by contact with the leading end portion of the screw, the holder can be smoothly moved inside the brush case because the holder is not prevented from moving inside the brush case if the damage is to the flat surface.
- In the present invention, the guide holes extend parallel in the axial direction on the peripheral wall of the brush case. Such a configuration allows guide holes to easily be formed even if the peripheral wall of the brush case is cylindrical.
- In the present invention, wherein the guide holes extend parallel in the axial direction on the peripheral wall of the brush case, a projecting portion that projects to the external peripheral side is preferably attached to the lower end side of the spindle.
- With this configuration, even when the wire-shaped grinding elements attempt to escape to the external peripheral side when the polisher brush is rotated to perform polishing or the like, they bump against the interior surface of the peripheral wall of the brush case and are held back, and if the elements attempt to escape to the interior peripheral side, they bump against the external peripheral side of the projecting portion disposed on the spindle and are held back. As a result, there is no difference in the extent of escape between the wire-shaped grinding elements positioned on the external peripheral side and the wire-shaped grinding elements positioned on the interior peripheral side. The situation in which the wire-shaped grinding elements positioned on the interior peripheral side become less abrasive can therefore be avoided because no difference in rigidity is exhibited between the wire-shaped grinding elements positioned on the external peripheral side and the wire-shaped grinding elements positioned on the interior peripheral side. The working precision can also be improved because the wire-shaped grinding elements are uniformly abraded. Since no variation occurs in the length (strand length) of the wire-shaped grinding elements from the holder, the change in conformability and grindability due to this effect is reduced, so the working precision is stable. At this point, if the projecting portion is attached with screws and screw stops so as to allow easy removal, the work of replacing worn wire-shaped grinding elements can easily be performed.
- In the present invention, wherein the guide holes extend parallel in the axial direction on the peripheral wall of the brush case, a projecting portion that projects to the external peripheral side is preferably attached to the lower end side of the spindle, a plurality of protrusions extended in a radial manner toward the external peripheral side are formed on an external peripheral side of the projecting portion, and the wire-shaped grinding elements are evenly positioned between the protrusions.
- With this configuration, even when the wire-shaped grinding elements attempt to escape to the external peripheral side, they bump against the interior surface of the peripheral wall of the brush case and are held back. When the wire-shaped grinding elements attempt to escape to the interior peripheral side, they bump against the external peripheral side of the projecting portion disposed on the spindle and are held back, and the range of escape is narrowed by the protrusions. As a result, there is no difference in the extend of escape between the wire-shaped grinding elements positioned on the external peripheral side and the wire-shaped grinding elements positioned on the interior peripheral side. The situation in which the wire-shaped grinding elements positioned on the interior peripheral side become less abrasive can therefore be avoided because no difference in rigidity is exhibited between the wire-shaped grinding elements positioned on the external peripheral side and the wire-shaped grinding elements positioned on the interior peripheral side. The working precision can also be improved because the wire-shaped grinding elements are uniformly abraded. Since no variation occurs in the length (strand length) of the wire-shaped grinding elements from the holder, the change in conformability and grindability due to this effect is reduced, so the working precision is stable. Variation in the rigidity of the wire-shaped grinding elements can be reduced in the peripheral direction as well because the protrusions prevent the wire-shaped grinding elements from escaping in the peripheral direction. At this point, if the projecting portion is attached with screws and screw stops so as to allow easy removal, the work of replacing worn wire-shaped grinding elements can easily be performed.
- In the present invention, wherein the guide holes extend parallel in the axial direction on the peripheral wall of the brush case, a plurality of protrusions extended in a radial manner toward the external peripheral side are preferably attached to the spindle, and the wire-shaped grinding elements are evenly positioned between the protrusions.
- With this configuration, even when the wire-shaped grinding elements attempt to escape to the external peripheral side, they bump against the interior surface of the peripheral wall of the brush case and are held back. When the wire-shaped grinding elements attempt to escape to the interior peripheral side, they bump against the external peripheral side of the spindle and are held back, and the range of escape is narrowed by the protrusions. As a result, there is no difference in the extend of escape between the wire-shaped grinding elements positioned on the external peripheral side and the wire-shaped grinding elements positioned on the interior peripheral side. The situation in which the wire-shaped grinding elements positioned on the interior peripheral side become less abrasive can therefore be avoided because no difference in rigidity is exhibited between the wire-shaped grinding elements positioned on the external peripheral side and the wire-shaped grinding elements positioned on the interior peripheral side. The working precision can also be improved because the wire-shaped grinding elements are uniformly abraded. Since no variation occurs in the length (strand length) of the wire-shaped grinding elements from the holder, the change in conformability and grindability due to this effect is reduced, so the working precision is stable. Variation in the rigidity of the wire-shaped grinding elements can be reduced in the peripheral direction as well because the protrusions prevent the wire-shaped grinding elements from escaping. At this point, if the projecting portion is attached with screws and screw stops so as to allow easy removal, the work of replacing worn wire-shaped grinding elements can easily be performed. The wire-shaped grinding elements have a flat cross-section, although a circular cross-section is shown in the drawings.
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FIG. 1 is a diagram depicting the state in which the upper portion of the brush-shaped grindstone is inserted and fixed in the interior of the brush case in a polisher brush wherein the present invention has been applied; -
FIG. 2 is a cross-sectional view through a section in which the polisher brush depicted inFIG. 1 is fixed in place with screws; -
FIG. 3 is a bottom view of the polisher brush depicted inFIG. 1 ; -
FIG. 4 is an exploded perspective view depicting the state in which the polisher brush depicted inFIG. 1 is disassembled into a brush case and a brush-shaped grindstone; -
FIGS. 5 to (D) are, respectively, a diagram depicting the state in which the surrounding region where the guide holes open is made into a flat surface on the external peripheral surface of the peripheral wall of the brush case in the polisher brush depicted inFIG. 1 ; a diagram depicting the state in which the surrounding region where the leading end portions of the screw shaft portions make contact on the external peripheral surface of the spindle; a longitude-sectional view depicting an enlarged view of the portion that stops the screw; and a cross-sectional view depicting an enlarged view of the portion that stops the screw; -
FIGS. 6(A) to (E) are diagrams depicting the manufacturing method for the brush-shaped grindstone depicted inFIG. 1 ; -
FIGS. 7(A) and (B) are, respectively, a diagram and a bottom view that schematically depict the polisher brush related toembodiment 2 of the present invention; -
FIGS. 8(A) and (B) are, respectively, a diagram and a bottom view that schematically depict the polisher brush related toembodiment 3 of the present invention; -
FIGS. 9(A) and (B) are, respectively, a diagram and a bottom view that schematically depict the polisher brush related to embodiment 4 of the present invention; -
FIG. 10 is a diagram depicting the structure of the brush-shaped grindstone related toother embodiment 1 of the present invention; and -
FIGS. 11(A), (B) are diagrams depicting the structure of the brush-shaped grindstone related toother embodiment 2 of the present invention. -
- 1
- polisher brush
- 2
- cylindrical brush case
- 3, 3A, 3B, 3C, 3E, 3F
- brush-shaped grindstones
- 6
- die material
- 20
- peripheral wall
- 21
- connecting shaft for driving
- 25
- spindle
- 26, 27
- guide holes
- 30
- axle hole
- 31
- holder
- 32
- wire-shaped grinding element
- 33
- free end of the wire-shaped grinding element
- 36, 37
- screw holes
- 41,42
- screw
- 60
- hole of the die material
- 71,72
- adhesive
- 310
- embedding hole
- 311
- grindstone holding surface
- 320
- rod assembly
- L
- axis line
- Embodiments of the present invention will now be described with reference to the drawings. In the drawings, the wire-shaped grinding elements have a substantially circular cross-section. It is, however, stressed that according to the present invention, the cross-section of the wire-shaped grinding elements is flat.
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FIG. 1 is a diagram depicting a state in which an upper portion (holder side) of a brush-shaped grindstone is inserted and fixed in an interior of a brush case in a polisher brush wherein the present invention has been applied.FIG. 2 is a cross-sectional view through a section in which the polisher brush depicted inFIG. 1 is fixed in place with screws.FIG. 3 is a bottom view of the polisher brush depicted inFIG. 1 .FIG. 4 is an exploded perspective view depicting a state in which the polisher brush depicted inFIG. 1 is disassembled into the brush case and the brush-shaped grindstone.FIGS. 5 (A), (B), (C), and (D) are, respectively, a diagram depicting a state in which a surrounding region where the guide holes open is made into a flat surface on an external peripheral surface of a peripheral wall of the brush case in the polisher brush depicted inFIG. 1 ; a diagram depicting a state in which a surrounding region where a leading end portion of an axle portion of a screw makes contact on an external peripheral surface of the spindle; a longitude-sectional view depicting an enlarged view of a portion that stops the screw; and a cross-sectional view depicting an enlarged view of the portion that stops the screw. - As shown in
FIGS. 1 to 4 , thepolisher brush 1 of the present embodiment comprises a cylindricalmetal brush case 2 that comprises a connectingshaft 21 for driving on an upper portion; a brush-shapedgrindstone 3 whose upper portion is inserted into thisbrush case 2; and screws 41 and 42 for fixing this brush-shapedgrindstone 3 in a predetermined position inside thebrush case 2. - In the present embodiment, an upper end portion of a
round virgate spindle 25 is fixed in the center of an upper bottom portion of thebrush case 2, and thisspindle 25 extends in a direction of an axis line L concentrically with aperipheral wall 20 in the interior side of thebrush case 2. On theperipheral wall 20 of thebrush case 2, guide holes 26 and 27, extended in the form of a groove in a direction parallel to the direction of the axis line L thereof, are formed in point-symmetrical positions on opposite sides of the axis line L. In the present invention, thebrush case 2 is composed such that theperipheral wall 20 is aluminum and thespindle 25 is stainless steel. - In the present embodiment, the brush-shaped
grindstone 3 comprises acylindrical metal holder 31 wherein a plurality of embeddingholes 310 are formed in isolated positions on a grindingelement holding surface 311, androd assemblies 320 whose base end portions are embedded in the embeddingholes 310. Therod assemblies 320 comprise a large number of wire-shapedgrinding elements 32, obtained such that a composite yarn composed of inorganic filaments such as alumina filaments is impregnated and hardened with a binder resin. Anaxle hole 30 through which thespindle 25 is inserted is formed in a center of theholder 31. A pair of screw holes 36 and 37 is formed in a peripheral wall of theholder 31 in point-symmetrical positions on the opposite sides of the axis line L, and these screw holes 36 and 37 reach from the external peripheral surface of the peripheral wall of theholder 31 to theaxle hole 30. - Thus, the brush-shaped
grindstone 3 used in the present embodiment has excellent grindability because large numbers of the wire-shapedgrinding elements 32 are subdivided as roundly bundledrod assemblies 320 and fixed with adhesive in the plurality of embeddingholes 310 of theholder 31, so the shavings are efficiently expelled during grinding work and the heat dissipating effect is high. Removal of burrs and work marks from the precision work component, polishing, and other processes can further be performed with good efficiency and high accuracy. The cost can also be reduced because high grinding performance can be obtained with a small number of rods. Adopting a configuration in which large numbers of the wire-shapedgrinding elements 32 are subdivided and fixed makes it possible to prevent the wire-shapedgrinding elements 32 from unraveling. This configuration is therefore advantageous in that it is highly safe. - When assembling the
polisher brush 1 using the brush-shapedgrindstone 3 and thebrush case 2 configured in this manner, thespindle 25 is fitted in theaxle hole 30 of theholder 31, the upper portion (on a side of the holder 31) of the brush-shapedgrindstone 3 is inserted inside thebrush case 2, thescrews brush case 2, as shown inFIGS. 5(C) and (D) , and thescrews holder 31. At this point, thescrews screws spindle 25. As a result, theholder 31 is fixed onto thespindle 25 of thebrush case 2 by way of thescrews brush case 2. - The
screws holder 31 through the guide holes 26 and 27 of thebrush case 2, and, in this state, the position of the brush-shapedgrindstone 3 inside thebrush case 2 can be adjusted in the direction of the axis line L by moving the brush-shapedgrindstone 3 inside thebrush case 2 in the direction of the axis line L. A protruding length of afree end 33 of the wire-shapedgrinding elements 32 at alower end portion 29 of thebrush case 2 can be adjusted, so the stiffness of the wire-shapedgrinding elements 32, in other words, the grindability and conformability can be optimized. - Adopting such a fixed configuration by way of the
screws peripheral wall 20 of thebrush case 2 in the area surrounding the openings of the guide holes 26 and 27, as shown inFIGS. 5(A), (C), and (D) . A surrounding area where the leading end portions of the axle portions of thescrews spindle 25 is aflat surface 250, as shown inFIGS. 5(B), (C), and (D) . - The
polisher brush 1 assembled in this manner is linked to a polisher by way of a connectingshaft 21 for driving, which protrudes at a top portion of thebrush case 2. Thepolisher brush 1 is then rotatably driven about the axis line L to remove all types of burrs and perform polishing work. Here, thepolisher brush 1 is not limited to rotary motion, but reciprocating action, oscillating action, swinging action, or a combination of these actions may be used to conduct motion. The movement may also be combined with motion that vertically moves thebrush 1 for polishing in the direction of the axis line L. - As such burr removal and polishing work is performed, the wire-shaped
grinding elements 32 also abrade as such, and the protruding length of the wire-shapedgrinding elements 32 at thelower end portion 29 of thebrush case 2 becomes shorter. Excellent burr removal and polishing work cannot be performed in this situation, so the protruding length of the wire-shapedgrinding elements 32 at thelower end portion 29 of thebrush case 2 must be adjusted and the stiffness of the wire-shapedgrinding elements 32, in other words, the grindability and conformability must be adjusted. - This adjustment operation entails loosening the
screws grindstone 3 in the direction of the axis line L inside thebrush case 2, and shifting the position of the brush-shapedgrindstone 3 downward in direction of the axis line L inside thebrush case 2. The protruding length of thefree end 33 of the wire-shapedgrinding elements 32 at thelower end portion 29 of thebrush case 2 can therefore again be adjusted to an optimal length. - The brush-shaped
grindstone 3 at this time moves in thebrush case 2 along the guide holes 26 and 27, because thescrews grindstone 3 through the guide holes 26 and 27 from the external peripheral side of thebrush case 2, are guided by the guide holes 26 and 27. As a result, in the present embodiment thescrews grindstone 3 when it is moved along the guide holes 26 and 27, and to fix the brush-shapedgrindstone 3 in a predetermined position within thebrush case 2. - In the present embodiment, the
holder 31 is fitted into thebrush case 2, and thespindle 25 is fitted into theaxle hole 30 of theholder 31. As a result, theholder 31 does not tilt inside thebrush case 2 even with considerable dimensional tolerance between an outer diameter of theholder 31 and an inner diameter of thebrush case 2. There is therefore no variation in the protruding length of the wire-shapedgrinding elements 32 at thelower end portion 29 of thebrush case 2. Furthermore, the depth of cutting of the wire-shapedgrinding elements 32 into the work is fixed, so the precision during grinding is improved. - The
holder 31 is fitted into thebrush case 2, but because thespindle 25 is fitted into theaxle hole 30 of theholder 31, theholder 31 remains fixed in the center position of thebrush case 2 even with considerable dimensional tolerance between the outside diameter of theholder 31 and the inside diameter of thebrush case 2. There is, therefore, no runout during rotation. Furthermore, the dimensional tolerance between the outside diameter of theholder 31 and the inside diameter of thebrush case 2 need not to be strict. Thus, even when shavings enter a space between theholder 31 and thebrush case 2, the protruding length of the wire-shapedgrinding elements 32 at thelower end portion 29 of thebrush case 2 can be easily adjusted because theholder 3 can be smoothly moved inside thebrush case 2 by loosening thescrews - In the present embodiment, when the wire-shaped
grinding elements 32 attempt to escape to an external peripheral side, they bump against an interior surface of theperipheral wall 20 of thebrush case 2 and are held back, and when the elements attempt to escape to an interior peripheral side, they bump against the external peripheral side of thespindle 25 and are held back. As a result, there is no leeway that allows easy escape between the wire-shapedgrinding elements 32 positioned on the external peripheral side and the wire-shapedgrinding elements 32 positioned on the interior peripheral side. The situation in which the wire-shapedgrinding elements 32 positioned on the interior peripheral side become less abrasive can therefore be avoided because no difference in rigidity is exhibited between the wire-shapedgrinding elements 32 positioned on the external peripheral side and the wire-shapedgrinding elements 32 positioned on the interior peripheral side. The working precision can also be improved because the wire-shapedgrinding elements 32 are uniformly abraded. Since no variation occurs in the length (strand length) of the wire-shapedgrinding elements 32 from theholder 31, the change in conformability and grindability due to this effect is reduced, so the working precision is stable. - In the present embodiment, the area surrounding the openings of the guide holes 26 and 27 has flat surfaces 260 and 270 on the external peripheral surface of the
peripheral wall 20 of thebrush case 2. In other words, heads of thescrews peripheral wall 20 of thebrush case 2. In the present embodiment, the heads to thescrews peripheral wall 20 because the area surrounding the openings of the guide holes 26 and 27 has flat surfaces 260 and 270. Even when thepolisher brush 1 rotates at high speed about the axis line L, wind noise and the like can be reduced and the safety improved. - In the present invention, the surrounding area where the leading end portions of the axle portions of the
screws spindle 25 is theflat surface 250. In other words, thespindle 25 is shaped as a round bar, and the leading end portions of thescrews screws spindle 25 because the surrounding area where the leading end portions of thescrews flat surface 250. The leading end portions of thescrews spindle 25 even when thepolisher brush 1 rotates at high speed. A space is further formed between the external peripheral surface of thespindle 25 and the internal peripheral surface of theaxle hole 30 of theholder 31 in the portion in which thisflat surface 250 is formed because the surrounding area where the leading end portions of thescrews spindle 25 is aflat surface 250. Therefore, even when the dimensional tolerance between the outside diameter of thespindle 25 and the inside diameter of theaxle hole 30 is strict, and the tilt and eccentricity of theholder 31 is more strictly prevented, problems do not arise whereby theholder 31 inside thebrush case 2 ceases moving due to the shavings that enter between the external peripheral surface of thespindle 25 and the internal peripheral surface of theaxle hole 30. Even if thespindle 25 is damaged by contact made by the leading end portions of thescrews holder 31 can be smoothly moved inside thebrush case 2 because theholder 31 is not prevented from moving inside thebrush case 2 if the damage is to theflat surface 250. -
FIGS. 6(A) to (E) are diagrams depicting the manufacturing method for the brush-shaped grindstone depicted inFIG. 1 . - In the present embodiment, manufacturing the brush-shaped
grindstone 3 used in thepolisher brush 1 entails forming embeddingholes 310 comprising a plurality of round holes in isolated positions in the peripheral direction on thegrindstone holding surface 311 of theholder 31, as shown inFIG. 3 in connection with the present embodiment. - A plurality of wire-shaped
grinding elements 32 are roundly bundled in the base end sides to formrod assemblies 320, and the base end sides of therod assemblies 320 are embedded in embeddingholes 310 and fixed with adhesive. The wire-shapedgrinding elements 32 are then aligned to a predetermined length, and the base end sides are thereafter aligned, as shown inFIG. 6(A) . The base end sides of the wire-shapedgrinding elements 32 are subsequently inserted intoholes 60 in adie material 6 formed to substantially the same size as the embeddingholes 310 of theholder 31, as shown inFIG. 6(B) , and in this state the base end sides of the wire-shapedgrinding elements 32 are fixed with silicon, epoxy, or another type of adhesive. As a result,rod assemblies 320 whose base end sides are fixed with adhesive 71 are formed, as shown inFIG. 6(C) . - Silicon, epoxy, or another type of
adhesive 72, for example, is subsequently applied to the base end sides of therod assemblies 320, as shown inFIG. 6(D) ; this is thereafter embedded in the embeddingholes 310 of theholder 32, as shown inFIG. 6(E) ; and in this state the adhesive 72 is hardened and the base end sides of therod assemblies 320 are fixed in the embeddingholes 310 by bonding. Thus, in the present embodiment a plurality of wire-shapedgrinding elements 32 is bundled to formrod assemblies 320, which are embedded in the embeddingholes 310 of theholder 31 and fixed by bonding. Therefore, because a plurality ofrod assemblies 320 are batch manufactured, and these are successively inserted into the embeddingholes 310 of theholder 31 and are fixed by bonding, the brush-shapedgrindstone 3 can be manufactured with excellent efficiency. - In the case of nylon filaments containing abrasive grain, the nylon filaments containing abrasive grain can be prevented from unraveling by folding the base end side to provide thickness and then embedding them in holes in the holder, but wire-shaped
grinding elements 32 that use inorganic filaments break when folded, so the base end side cannot be folded as can nylon filaments or other materials. According to the present embodiment, however, the base end side of a bundle of wire-shapedgrinding elements 32 is hardened with adhesive 71 in advance, and the base end side thereof has substantially the same diameter as the embeddingholes 310, so with therod assemblies 320 embedded in embeddingholes 310, therod assemblies 320 do not fall over. The productivity of the brush-shapedgrindstone 3 can therefore be improved. In addition, the wire-shapedgrinding elements 32 do not unravel, because the base end sides of the wire-shapedgrinding elements 32 are hardened withadhesive 71. -
FIGS. 7(A) and (B) are, respectively, a diagram and a bottom view that schematically depict the polisher brush related toembodiment 2 of the present invention. - In the present embodiment, a
discoid projecting portion 50 that projects to the external peripheral side is attached to the lower end side of thespindle 25 withscrews 55, screw stops, or the like so as to allow easy removal, as shown inFIGS. 7(A) and (B) . The other features of this structure are the same asembodiment 1, and are therefore omitted from the description. - In the present embodiment, when the wire-shaped
grinding elements 32 attempt to escape to the external peripheral side, they bump against the interior surface of theperipheral wall 20 of thebrush case 2 and are held back, and when the elements attempt to escape to the interior peripheral side, they bump against an external peripheral surface of the projectingportion 50 disposed on thespindle 25 and are held back. As a result, there is no leeway that allows easy escape between the wire-shapedgrinding elements 32 positioned on the external peripheral side and the wire-shapedgrinding elements 32 positioned on the interior peripheral side. The situation in which the wire-shapedgrinding elements 32 positioned on the interior peripheral side become less abrasive can therefore be avoided because no difference in rigidity is exhibited between the wire-shapedgrinding elements 32 positioned on the external peripheral side and the wire-shapedgrinding elements 32 positioned on the interior peripheral side. The working precision can also be improved because the wire-shapedgrinding elements 32 are uniformly abraded. Since no variation occurs in the length (strand length) of the wire-shapedgrinding elements 32 from theholder 31, the change in grindability and conformability due to this effect is reduced, so the working precision is stable. - The
holder 31 can be removed from thespindle 25 merely by removing the projectingportion 50 because the projectingportion 50 is attached with ascrew 55 to thespindle 25 so as to allow easy removal. When the wire-shapedgrinding elements 32 become worn out, the work of replacing the wire-shapedgrinding elements 32 and theholder 31 with new ones can therefore easily be performed. -
FIGS. 8(A) and (B) are, respectively, a diagram and a bottom view that schematically depict the polisher brush related toembodiment 3 of the present invention. - In the present embodiment, a projecting
portion 50 that projects to the external peripheral side at the lower end side is attached to the lower end surface of thespindle 25 withscrews 55, screw stops, or the like so as to allow easy removal, as shown inFIGS. 8(A) and (B) ; a plurality of protrusions 51 extended in a radial manner toward the external peripheral side are further formed on an external peripheral side of this projectingportion 50; and wire-shapedgrinding elements 32 are evenly positioned between these protrusions 51. The other features of this structure are the same asembodiment 1, and are therefore omitted from the description. - In the present embodiment, when the wire-shaped
grinding elements 32 attempt to escape to the external peripheral side, they bump against the interior surface of theperipheral wall 20 of thebrush case 2 and are held back, and when the elements attempt to escape to the interior peripheral side, they bump against the external peripheral side of the projectingportion 50 disposed on thespindle 25, escape is restrained, and the range of escape is narrowed by the protrusions 51. As a result, there is no difference in the extend of escape between the wire-shapedgrinding elements 32 positioned on the external peripheral side and the wire-shapedgrinding elements 32 positioned on the interior peripheral side. The situation in which the wire-shapedgrinding elements 32 positioned on the interior peripheral side become less abrasive can therefore be avoided because no difference in rigidity is exhibited between the wire-shapedgrinding elements 32 positioned on the external peripheral side and the wire-shapedgrinding elements 32 positioned on the interior peripheral side. The working precision can also be improved because the wire-shapedgrinding elements 32 are uniformly abraded. Since no variation occurs in the length (strand length) of the wire-shapedgrinding elements 32 from theholder 31, the change in grindability and conformability due to this effect is reduced, so the working precision is stable. - Furthermore, the variation in the rigidity of the wire-shaped
grinding elements 32 can be reduced in the peripheral direction as well because the wire-shapedgrinding elements 32 can be prevented from escaping in the peripheral direction by the protrusions 51. - The
holder 31 can be removed from thespindle 25 merely by removing the projectingportion 50 because the projectingportion 50 is attached with ascrew 55 to thespindle 25 so as to allow easy removal. When the wire-shapedgrinding elements 32 become worn out, the work of replacing the wire-shapedgrinding elements 32 and theholder 31 with new ones can therefore easily be performed. -
FIGS. 9(A) and (B) are, respectively, a diagram and a bottom view that schematically depict the polisher brush related to embodiment 4 of the present invention. - In the present embodiment, a
cylindrical body 520 comprising a plurality ofprotrusions 52 in a form of blades extended in a radial manner toward the external peripheral side is attached to the lower end surface of thespindle 25 withscrews 55, screw stops, or the like so as to allow easy removal, as shown inFIGS. 9(A) and (B) , and wire-shapedgrinding elements 32 are evenly positioned between theseprotrusions 52. The other features of this structure are the same asembodiment 1, and are therefore omitted from the description. - In the present embodiment, when the wire-shaped
grinding elements 32 attempt to escape to the external peripheral side, they bump against the interior surface of theperipheral wall 20 of thebrush case 2 and are held back. When the wire-shapedgrinding elements 32 attempt to escape to the interior peripheral side, they bump against the external peripheral surface of thespindle 25, escape is restrained, and the range of escape is narrowed by theprotrusions 52. As a result, there is no difference in the extend of escape between the wire-shapedgrinding elements 32 positioned on the external peripheral side and the wire-shapedgrinding elements 32 positioned on the interior peripheral side. The situation in which the wire-shapedgrinding elements 32 positioned on the interior peripheral side become less abrasive can therefore be avoided because no difference in rigidity is exhibited between the wire-shapedgrinding elements 32 positioned on the external peripheral side and the wire-shapedgrinding elements 32 positioned on the interior peripheral side. The working precision can also be improved because the wire-shapedgrinding elements 32 are uniformly abraded. Since no variation occurs in the length (strand length) of the wire-shapedgrinding elements 32 from theholder 31, the change in grindability and conformability due to this effect is reduced, so the working precision is stable. - Furthermore, the variation in the rigidity of the wire-shaped
grinding elements 32 can be reduced in the peripheral direction as well because the wire-shapedgrinding elements 32 can be prevented from escaping in the peripheral direction by theprotrusions 52. - The
holder 31 can be removed from thespindle 25 merely by removing thecylindrical body 520 because thecylindrical body 520 comprising blade-shapedprotrusions 52 is attached with ascrew 55 to thespindle 25 so as to allow easy removal. When the wire-shapedgrinding elements 32 become worn out, the work of replacing the wire-shapedgrinding elements 32 and theholder 31 with new ones can therefore easily be performed. - The brush-shaped
grindstone 3 related to the above embodiments is an example in which the bottom surface of thecylindrical holder 31 serves as the grindingelement holding surface 311, and a plurality of embeddingholes 310 are formed in a single line about the axis line L of the center of rotation, but the present invention may also be applied to a brush-shapedgrindstone 3A in whichrod assemblies 320 are embedded in the embeddingholes 310 that comprise a plurality of round holes formed in a plurality of lines; for example, two lines, about the axis line L of the center of rotation in the grindingelement holding surface 311 comprising the bottom surface of thecylindrical holder 31, as shown inFIG. 10 . - Although this is not shown in the drawings, the present invention may further be applied to a brush-shaped grindstone in which rod assemblies are embedded in embedding holes that comprise a plurality of round holes formed at irregular positions about the axis line of the center of rotation in the grinding element holding surface of holders of various shapes.
- The embodiments described above entail the use of
rod assemblies 320 in which the base end portions of a plurality of the wire-shapedgrinding elements 21 are roundly bundled, but it is also possible to userod assemblies 320 in which the base end portions of a plurality of wire-shapedgrinding elements 21 are flatly aligned, as shown inFIG. 11(A) . - In this case, a plurality of embedding
holes 310 in the form of grooves are formed on the grindingelement holding surface 311 comprising the bottom surface of thecylindrical holder 31,rod assemblies 320 in which the base end portions of the plurality of wire-shapedgrinding elements 21 are flatly aligned are formed, and the base end sides of theserod assemblies 320 may be fixed with adhesive in the embeddingholes 310 of theholder 31, in the manner of the brush-shapedgrindstone 3E shown inFIG. 11(B) . - In the above embodiments, the composite yarn with the substantially circular cross-section was used in the wire-shaped
grinding elements 32 without twisting the inorganic filaments, but a configuration obtained by twisting the inorganic filaments into a composite yarn may also be adopted. When inorganic filaments are twisted into the composite yarn, an advantage is obtained whereby the leading ends of the wire-shapedgrinding elements 32 are resistant to splitting. - While in the above embodiments, the cross-sections of the wire-shaped
grinding elements 32 is illustrated in a configuration in which the shape is substantially circular, according to the present invention the configuration is such that the cross-section is flat. When the cross-sections of the wire-shaped grinding elements are flat, plugging is minimal during burr removal and polishing in comparison with the configuration in which the shape of the cross-section is substantially circular. An advantage is obtained whereby flexibility is exhibited in the wire-shaped grinding elements, and breaking is minimized. When the cross-sections of the wire-shaped grinding elements are flat, the ratio of flatness represented by L/T is preferably 1.6 to 15, but is more preferably in a range of 1.6 to 10, where L is the length of the cross-section, and T is the breadth of the cross-section. - As described above, according to the present invention, a plurality of wire-shaped grinding elements are bundled to form rod assemblies, and these are embedded in the embedding holes of the holder and fixed by bonding. As a result, a plurality of rod assemblies are batch manufactured, and these are successively inserted into the embedding holes of the holder and fixed. The brush-shaped grindstone can therefore be manufactured with excellent efficiency.
Claims (2)
- A polisher brush (1) which comprises: a brush-shaped grindstone (3, 3A, 3E) having a plurality of wire-shaped grinding elements (32), each element being formed such that a composite yarn composed of inorganic filaments is impregnated and hardened with a resin, a cylindrical brush case (2)for mounting the brush-shaped grindstone, and screws (41, 42) for fixing the brush-shaped grindstone on the brush case (2) wherein
the brush-shaped grindstone has a holder (31) fixed by the screws (41, 42) on an interior side of the brush case (2), a plurality of embedding holes (310) formed in the holder (31) in isolated positions, and rod assemblies (320) whose base end portions are embedded in the respective embedding holes (310), each rod assembly (320) being composed of a plurality of wire-shaped grinding elements (32) and free ends (33) of the wire-shaped grinding elements (32) protruding from lower end portion of the brush case (2), and wherein
the brush case (2) is formed with a spindle (25) extending inside the brush case along an axial direction thereof, and with guide holes (26, 27) extending in the form of grooves in a peripheral wall (20) of the brush case, wherein the guide holes (26, 27) being extending parallel to the axial direction of the brush case (2);
the holder (31) is formed with an axle hole (30) in which the spindle (25) is fitted, and with screw holes (36, 37) that extend from an external peripheral surface of the holder to the axle hole (30);
the screws (41, 42) are secured in the screw holes (36, 37) so as to be attached to the external peripheral side of the brush case (2) and to pass completely through the guide holes (26, 27) in a state in which leading end portions of screw shafts come in contact with an external peripheral surface of the spindle (25);
characterized in that the wire-shaped grinding elements (32) have a flat cross-section. - The polisher brush (1) according to claim 1, wherein
the wire-shaped grinding elements (32) have a ratio of flatness represented by L/T that is within the range of 1.6 to 15, where L is the major diameter of the cross-section of the wire-shaped grinding element and T is the minor diameter thereof.
Applications Claiming Priority (3)
Application Number | Priority Date | Filing Date | Title |
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JP2002212249 | 2002-07-22 | ||
JP2002212249 | 2002-07-22 | ||
PCT/JP2003/008866 WO2004009293A1 (en) | 2002-07-22 | 2003-07-11 | Method of producing brush-like grind stone, the brush-like grind stone, and brush for grind machine |
Publications (3)
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EP1543924A1 EP1543924A1 (en) | 2005-06-22 |
EP1543924A4 EP1543924A4 (en) | 2007-01-24 |
EP1543924B1 true EP1543924B1 (en) | 2010-02-17 |
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Application Number | Title | Priority Date | Filing Date |
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EP03741368A Expired - Lifetime EP1543924B1 (en) | 2002-07-22 | 2003-07-11 | Polisher brush |
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US (1) | US7434289B2 (en) |
EP (1) | EP1543924B1 (en) |
JP (1) | JP4421476B2 (en) |
KR (1) | KR101011911B1 (en) |
CN (2) | CN100396439C (en) |
AU (1) | AU2003281502A1 (en) |
DE (1) | DE60331327D1 (en) |
ES (1) | ES2340921T3 (en) |
TW (1) | TWI236951B (en) |
WO (1) | WO2004009293A1 (en) |
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CN2384742Y (en) * | 1999-08-02 | 2000-06-28 | 蔡政廷 | Improved grinding medium structure |
US6309291B1 (en) * | 1999-10-14 | 2001-10-30 | Bill Robertson Cox | Brush cutter |
US6422932B1 (en) * | 1999-10-15 | 2002-07-23 | 3M Innovative Properties Company | Integrally molded brush and method for making the same |
JP2001138251A (en) * | 1999-11-17 | 2001-05-22 | Yuichiro Niizaki | Grinding tool |
JP2001198832A (en) | 2000-01-14 | 2001-07-24 | Taimei Chemicals Co Ltd | Abrasive |
JP4554064B2 (en) | 2000-12-19 | 2010-09-29 | 優一郎 新崎 | Linear brush material |
JP2002254277A (en) * | 2000-12-28 | 2002-09-10 | Xebec Technology Co Ltd | Brush type grindstone, and method and device for deburring and polishing |
JP2002210661A (en) * | 2001-01-16 | 2002-07-30 | Xebec Technology Co Ltd | Brush-like grinding wheel, and deburring and polishing method |
JP2002210662A (en) * | 2001-01-16 | 2002-07-30 | Xebec Technology Co Ltd | Brush-like grinding wheel, and deburring and polishing method |
ITBO20010376A1 (en) * | 2001-06-15 | 2002-12-15 | Andrea Dondi | MODULAR ROLLER FOR INDUSTRIAL REVOLVING CYLINDRICAL BRUSHES, PARTICULARLY FOR EXTERIORS |
JP2003062761A (en) | 2001-08-24 | 2003-03-05 | Xebec Technology Co Ltd | Brush for polishing machine |
JP3975073B2 (en) | 2001-11-01 | 2007-09-12 | 株式会社ジーベックテクノロジー | Brush for polishing machine |
-
2003
- 2003-07-11 ES ES03741368T patent/ES2340921T3/en not_active Expired - Lifetime
- 2003-07-11 WO PCT/JP2003/008866 patent/WO2004009293A1/en active Application Filing
- 2003-07-11 US US10/502,012 patent/US7434289B2/en active Active
- 2003-07-11 DE DE60331327T patent/DE60331327D1/en not_active Expired - Lifetime
- 2003-07-11 CN CNB038022001A patent/CN100396439C/en not_active Expired - Lifetime
- 2003-07-11 JP JP2004522722A patent/JP4421476B2/en not_active Expired - Lifetime
- 2003-07-11 EP EP03741368A patent/EP1543924B1/en not_active Expired - Lifetime
- 2003-07-11 AU AU2003281502A patent/AU2003281502A1/en not_active Abandoned
- 2003-07-11 KR KR1020047010351A patent/KR101011911B1/en active IP Right Grant
- 2003-07-11 CN CNA2007101118142A patent/CN101143434A/en active Pending
- 2003-07-16 TW TW092119465A patent/TWI236951B/en not_active IP Right Cessation
Also Published As
Publication number | Publication date |
---|---|
DE60331327D1 (en) | 2010-04-01 |
JPWO2004009293A1 (en) | 2005-11-17 |
KR20050023229A (en) | 2005-03-09 |
EP1543924A4 (en) | 2007-01-24 |
CN101143434A (en) | 2008-03-19 |
US20050153642A1 (en) | 2005-07-14 |
EP1543924A1 (en) | 2005-06-22 |
TWI236951B (en) | 2005-08-01 |
ES2340921T3 (en) | 2010-06-11 |
TW200401690A (en) | 2004-02-01 |
WO2004009293A1 (en) | 2004-01-29 |
CN1615208A (en) | 2005-05-11 |
AU2003281502A1 (en) | 2004-02-09 |
US7434289B2 (en) | 2008-10-14 |
JP4421476B2 (en) | 2010-02-24 |
AU2003281502A8 (en) | 2004-02-09 |
KR101011911B1 (en) | 2011-02-01 |
CN100396439C (en) | 2008-06-25 |
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